Tool-holdeb



A. HUNTER.

TOOL HOLDER. APPLICATION FILED Aug-31 IBIS.

Patented Augyls, 1912').

ALBERT HUNTER, or VANCOUVER, WASHINGTON.

TooL-HoLnER.

Specification of Letters Patent.

Patented Aug. 19, 1919.

Application filed August 31, 1918. Serial No. 252,207.

To all whom it may concern:

Be it known that I, ALBERT HUNTER, a citizen of the United States, residing at Van couver, in the county of Clarke and State of WYashington, have invented certain new and useful Improvements in Tool-Holders, of which the following is a specification.

The present invention relates to improvements in wood-working tools, and particularly to a power driven chisel for the special work on the hull of a wooden vessel, taking the place of the manually operated adz, but of course the tool is applicable for use in other ways, and the chlsel or edge tool illustrated in this exemplification of the in vention, may be replaced by other tools, when desired.

The primary object of the invention is the provision of a wood working tool that is power driven and is attachable with facility to the well known type of riveting or ham- I .mering machineof the pneumatic type, from which it receix'es power.

' The invention consists essentially in an attachment for supporting the cutting tool, and in the sub-combinations and arrangements of parts whereby the tool is supported and guided in the attachment, and driven from the source of power.

In the accompanying drawings one complete example of the physical embodiment of the invention is illustrated, showing-a chisel or edge tool, and constructed and arranged according to the best mode so far devised for the practical application of the principles of the invention, and it will be apparent that tools with different functions, and designed for other urposes may be used instead of this cutting chisel illustrated.

Figure 1 is aside elevationofa machine embodying the invention, showing it attached to the casing of a pneumatic hammerof well known type.

Fig. 2 is a transverse sectional view at line 22 of Fig. 1.

Fig. 3 is a transverse, sectional view at line 3-3 of Fig. 1.

Fig. .4 is a' similar view, at l ine 4-4 of Fig. 1.

Fig. 5 is a perspective, enlarged, of the tool rest.

Fig. 6 is a perspectivelview of a tool or chisel.

Inthe preferred embodiment of the invention as depicted in the drawings, a pneumatic hammer, or so much thereof as 18 necessaryto illustrate the applicability of they invention, isshown, the casing being indicated as 1; 2 a cylindrical portion of the barrel; 3, a tapered extension of the barrel, 4 the reciprocating iston stem, and 5, the reciprocable piston t at is operated by motive fluid, and the reciprocal movement of the stem is utilized to reciprocate, or at least to push the chisel or tool 6 .forward on its working stroke, the reciprocal movement of the pneumatic hammer being accomplished in usual manner, and as it is not a part of the present invention, details of this construction are not herein illustrated.

The tool is supported and guided in an attachment or frame comprising essentially the two parallel bars 7, 7, alined with the casing 1, and attached to the cylindricalbarrel portion 2 of the casing through the instrumentality of the sectional sleeve portions 8, 8, at the ends of these bars, each sectional sleeve having pairs of flanges 8 for the clamping bolts 9, and-in this manner the attachment is supported, rigidly, from the pneumatic hammer casing.

The two frame bars 7 are connected by the brace ring or loop 10, located interme- 7, said bar having-a bifurcated end for this pur ose. I

At 16, the tool or chisel is provlded with a shank that is rectangular in cross section,

and this portion of the tool is supported and I guided in its reciprocal movement in the sectional head 11 11, so that the cutting edges 17 of the tool may perform their functions in well known manner.

Preferably the tool is operated at an angle, somewhat as illustrated in Fig. 1, and to provide an accurate and reliable guide or rest for the tool, when performing close work, a base plate 18 is employed, this being formed with a central,triangular shaped web, 19. formed witlrthe angular slot 20, through which the bolt 15 of the attachment frame is passed (see Fig. 2). When adjusted to slred work, the web of the plate is clamped between the ends 7' and lugs 14, and the plate thus forms a rigid and stable support and guide for the tool as it passes through the sectional head.

The outward or working stroke of the chisel is imparted thereto by the power driven hammer through its stem 4 and through the stem 21 of the chisel or tool, but the return stroke of the chisel is not accomplished by the hammer, but is automatically accomplished as follows; 7

Near the inner end of the chisel 6 an annular head or shoulder 22 is formed, having a spirally arranged groove 23 in its upper face, and this groove forms the anchorage for one end of the contractile spring 24:. The other end of'the spring, (which surrounds the barrel extension 3 of the hammer) is anchored between thecircular horns 25 25 integral with and located at the inner sides of the bars 7 7 and opposite each other.

- Thus the stem 21, is pushed out of the extension 3 by the stem' 4, and returned by the action of the contractile spring 24. This arrangement and connection between the chisel and hammer barrel extension provides a simple, but efiicient and effective return stroke mechanism which co-acts in correct manner with the motive fluid hammer, and the rectangular shank 16 of the chisel,reciprocating through the head 1111, holds the tool accurately to its work.

As before stated, the plate 18 may be adju'sted at different angles, through its slotted web and the bolt 15, as desired, and of course it will be understood that other tools, for diiferent purposes but actuated in the same manner as this chisel, mayreplace the tool herein shown.

proper altitude for accomplishing the de- Claims 1. The combination with a power driven including a cross head, a tool reciprocable in the hea and supported in the device and adapted .to be actuated by the driving member'for its working stroke, and means for returning the tool.

2. The combination with the power driven device'having a reciprocable driving member, of a supporting frame having a crosshead and a tool reciprocable therein and actuated for its operating stroke by the driving member, and a return spring suspended between the'tool and, its frame engaging the tool at one end and a part of the frame at the other. 7

3. The combination with the power device and its reciprocable driving member, of a supporting frame having a cross-head and a tool reciprocable in the head and actuated by the driving member ,for its working stroke, a contractile'spring suspended between the tool and frame engaging the tool on one end and a part of the frame on the other, and an adjustable rest plate for the frame. c

I 4. The combination with the barrel of the power device and its reciprocable driving member, of a frame attached to the barrel and provided with a crosshead, a tool reciprocable in the cross headand havin a stem movable in the barrel and co-actmg with the driving member, a spring encircling the barrel and engaging the. tool at; one end and engaginga part of the frame at the other end, and an adjustable rest plate for the frame.

In testimony whereof I afiix my signature.

ALBERT HUNTER. 

